Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$113M |
| 2 |
SPDR Gold Trust
GLD
|
+$68.6M |
| 3 |
NVIDIA
NVDA
|
+$63.4M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$55.2M |
| 5 |
Apple
AAPL
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$27.1M |
| 2 |
Qualcomm
QCOM
|
+$24.6M |
| 3 |
Walt Disney
DIS
|
+$21.2M |
| 4 |
Advanced Micro Devices
AMD
|
+$18.2M |
| 5 |
Snowflake
SNOW
|
+$16.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.44% |
| 2 | Consumer Discretionary | 0.32% |
| 3 | Healthcare | 0.22% |
| 4 | Financials | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1376
PUT
Teradyne
TER
$54.8B
| $4.85M | ﹤0.01% |
48,300
-4,900
| -9% | -$517K |
|
1377
CALL
ZIM Integrated Shipping Services
ZIM
$3B
| $4.85M | ﹤0.01% |
464,200
+186,300
| +67% | +$2.37M |
|
1378
PUT
Celanese
CE
$5.09B
| $4.84M | ﹤0.01% |
38,600
+15,700
| +69% | +$1.93M |
|
|
MRTX
1379
CALL
DELISTED
Mirati Therapeutics, Inc. Common Stock
MRTX
| $4.83M | ﹤0.01% |
111,000
-8,700
| -7% | -$311K |
|
1380
CALL
Citizens Financial Group
CFG
$30.4B
| $4.83M | ﹤0.01% |
180,200
-188,600
| -51% | -$5.39M |
|
1381
PUT
Silicon Motion
SIMO
$9.19B
| $4.82M | ﹤0.01% |
94,000
-34,600
| -27% | -$1.97M |
|
1382
CALL
Stanley Black & Decker
SWK
$14.2B
| $4.81M | ﹤0.01% |
57,600
-7,400
| -11% | -$686K |
|
1383
Immunovant
IMVT
$8.09B
| $4.81M | ﹤0.01% |
125,212
+104,706
| +511% | +$2.37M |
|
1384
PUT
Magna International
MGA
$17.9B
| $4.8M | ﹤0.01% |
89,500
+53,700
| +150% | +$3.13M |
|
|
CPE
1385
CALL
DELISTED
Callon Petroleum Company
CPE
| $4.78M | ﹤0.01% |
122,200
+51,800
| +74% | +$1.91M |
|
1386
VF Corp
VFC
$6.68B
| $4.78M | ﹤0.01% |
270,376
+10,474
| +4% | +$199K |
|
|
K
1387
PUT
DELISTED
Kellanova
K
| $4.75M | ﹤0.01% |
85,094
+38,979
| +85% | +$2.32M |
|
1388
PUT
Elbit Systems
ESLT
$38.4B
| $4.75M | ﹤0.01% |
24,000
+17,700
| +281% | +$3.62M |
|
|
IPFF
1389
PUT
DELISTED
iShares International Preferred Stock ETF
IPFF
| $4.74M | ﹤0.01% |
108,700
+13,000
| +14% | +$567K |
|
1390
PUT
WisdomTree US Total Dividend Fund
DTD
$1.65B
| $4.74M | ﹤0.01% |
55,100
+51,200
| +1,313% | +$3.2M |
|
1391
CALL
Arbor Realty Trust
ABR
$960M
| $4.74M | ﹤0.01% |
312,100
-39,700
| -11% | -$628K |
|
1392
PUT
East-West Bancorp
EWBC
$17.9B
| $4.72M | ﹤0.01% |
89,600
+17,000
| +23% | +$956K |
|
1393
CALL
RBC Bearings
RBC
$18.8B
| $4.71M | ﹤0.01% |
20,100
+14,700
| +272% | +$3.33M |
|
1394
CALL
Ambarella
AMBA
$2.99B
| $4.7M | ﹤0.01% |
88,700
+17,900
| +25% | +$1.26M |
|
1395
PUT
Diageo
DEO
$46.2B
| $4.7M | ﹤0.01% |
31,500
-1,400
| -4% | -$234K |
|
1396
CALL
Illinois Tool Works
ITW
$81.4B
| $4.7M | ﹤0.01% |
20,400
+13,300
| +187% | +$3.25M |
|
1397
PUT
WD-40
WDFC
$3.1B
| $4.69M | ﹤0.01% |
23,100
+6,400
| +38% | +$1.37M |
|
1398
PUT
Forward Air
FWRD
$482M
| $4.69M | ﹤0.01% |
+68,200
| New | +$6M |
|
|
LAC
1399
CALL
DELISTED
Lithium Americas Corp. Common Shares
LAC
| $4.68M | ﹤0.01% |
275,400
+47,600
| +21% | +$898K |
|
1400
PUT
Deckers Outdoor
DECK
$13.3B
| $4.68M | ﹤0.01% |
54,600
+40,800
| +296% | +$3.65M |
|
Similar funds
Simplex Trading's Q3 2023 Portfolio in Review
As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.
Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.
By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.
- Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
- Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
- Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
- Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
- Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
- Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
- Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.
Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.